anmolanmol1234 commented on code in PR #7669: URL: https://github.com/apache/hadoop/pull/7669#discussion_r2465671952
########## hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/WriteThreadPoolSizeManager.java: ########## @@ -0,0 +1,388 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.hadoop.fs.azurebfs; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.Closeable; +import java.io.IOException; +import java.lang.management.ManagementFactory; +import java.lang.management.MemoryMXBean; +import java.lang.management.MemoryUsage; + +import com.sun.management.OperatingSystemMXBean; + +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.ThreadPoolExecutor; +import java.util.concurrent.TimeUnit; +import java.util.concurrent.atomic.AtomicInteger; +import java.util.concurrent.locks.Lock; +import java.util.concurrent.locks.ReentrantLock; + +import org.apache.hadoop.util.concurrent.HadoopExecutors; + +import static org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.LOW_HEAP_SPACE_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.AbfsHttpConstants.MEDIUM_HEAP_SPACE_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.BYTES_PER_GIGABYTE; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_CPU_LOW_MEMORY_REDUCTION_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_CPU_REDUCTION_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HIGH_MEDIUM_HEAP_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.HUNDRED_D; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_HEAP_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_HIGH_MEMORY_DECREASE_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.LOW_CPU_POOL_SIZE_INCREASE_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MEDIUM_CPU_LOW_MEMORY_REDUCTION_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.MEDIUM_CPU_REDUCTION_FACTOR; +import static org.apache.hadoop.fs.azurebfs.constants.FileSystemConfigurations.THIRTY_SECONDS; + +/** + * Manages a thread pool for writing operations, adjusting the pool size based on CPU utilization. + */ +public final class WriteThreadPoolSizeManager implements Closeable { + + /* Maximum allowed size for the thread pool. */ + private final int maxThreadPoolSize; + /* Executor for periodically monitoring CPU usage. */ + private final ScheduledExecutorService cpuMonitorExecutor; + /* Thread pool whose size is dynamically managed. */ + private volatile ExecutorService boundedThreadPool; + /* Lock to ensure thread-safe updates to the thread pool. */ + private final Lock lock = new ReentrantLock(); + /* New computed max size for the thread pool after adjustment. */ + private volatile int newMaxPoolSize; + /* Logger instance for logging events from WriteThreadPoolSizeManager. */ + private static final Logger LOG = LoggerFactory.getLogger( + WriteThreadPoolSizeManager.class); + /* Map to maintain a WriteThreadPoolSizeManager instance per filesystem. */ + private static final ConcurrentHashMap<String, WriteThreadPoolSizeManager> + POOL_SIZE_MANAGER_MAP = new ConcurrentHashMap<>(); + /* Name of the filesystem associated with this manager. */ + private final String filesystemName; + /* Initial size for the thread pool when created. */ + private final int initialPoolSize; + /* Initially available heap memory. */ + private final long initialAvailableHeapMemory; + /* The configuration instance. */ + private final AbfsConfiguration abfsConfiguration; + + /** + * Private constructor to initialize the write thread pool and CPU monitor executor + * based on system resources and ABFS configuration. + * + * @param filesystemName Name of the ABFS filesystem. + * @param abfsConfiguration Configuration containing pool size parameters. + */ + private WriteThreadPoolSizeManager(String filesystemName, + AbfsConfiguration abfsConfiguration) { + this.filesystemName = filesystemName; + this.abfsConfiguration = abfsConfiguration; + int availableProcessors = Runtime.getRuntime().availableProcessors(); + /* Get the heap space available when the instance is created */ + this.initialAvailableHeapMemory = getAvailableHeapMemory(); + /* Compute the max pool size */ + int computedMaxPoolSize = getComputedMaxPoolSize(availableProcessors, initialAvailableHeapMemory); + + /* Get the initial pool size from config, fallback to at least 1 */ + this.initialPoolSize = Math.max(1, + abfsConfiguration.getWriteConcurrentRequestCount()); + + /* Set the upper bound for the thread pool size */ + this.maxThreadPoolSize = Math.max(computedMaxPoolSize, initialPoolSize); + AtomicInteger threadCount = new AtomicInteger(1); + this.boundedThreadPool = Executors.newFixedThreadPool( + initialPoolSize, + r -> { + Thread t = new Thread(r); + t.setName("abfs-boundedwrite-" + threadCount.getAndIncrement()); + return t; + } + ); + ThreadPoolExecutor executor = (ThreadPoolExecutor) this.boundedThreadPool; + executor.setKeepAliveTime( + abfsConfiguration.getWriteThreadPoolKeepAliveTime(), TimeUnit.SECONDS); + executor.allowCoreThreadTimeOut(true); + /* Create a scheduled executor for CPU monitoring and pool adjustment */ + this.cpuMonitorExecutor = Executors.newScheduledThreadPool(1); + } + + /** Returns the internal {@link AbfsConfiguration}. */ + private AbfsConfiguration getAbfsConfiguration() { + return abfsConfiguration; + } + + /** + * Calculates the max thread pool size using a multiplier based on + * memory per core. Higher memory per core results in a larger multiplier. + * + * @param availableProcessors Number of CPU cores. Review Comment: taken -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
